mcs/class/referencesource/System.Data.Entity/System/Data/Common/Utils/Pair.cs

   1 //---------------------------------------------------------------------
   2 // <copyright file="Pair.cs" company="Microsoft">
   3 //      Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //
   6 // @owner Microsoft
   7 // @backupOwner Microsoft
   8 //---------------------------------------------------------------------
   9
  10 using System;
  11 using System.Collections;
  12 using System.Collections.Generic;
  13 using System.Text;
  14 using System.Diagnostics;
  15 using System.Linq;
  16
  17
  18 namespace System.Data.Common.Utils
  19 {
  20     internal class Pair<TFirst, TSecond> : InternalBase
  21     {
  22         #region Fields
  23         private readonly TFirst first;
  24         private readonly TSecond second;
  25
  26         #endregion
  27
  28         #region Constructor
  29         internal Pair(TFirst first, TSecond second)
  30         {
  31             this.first = first;
  32             this.second = second;
  33         }
  34         #endregion
  35
  36         #region Properties
  37         internal TFirst First
  38         {
  39             get
  40             {
  41                 return first;
  42             }
  43         }
  44
  45         internal TSecond Second
  46         {
  47             get
  48             {
  49                 return second;
  50             }
  51         }
  52         #endregion
  53
  54         #region Methods
  55         public override int GetHashCode()
  56         {
  57             return (first.GetHashCode()<<5) ^ second.GetHashCode();
  58         }
  59
  60         public bool Equals(Pair<TFirst, TSecond> other)
  61         {
  62             return first.Equals(other.first) && second.Equals(other.second);
  63         }
  64
  65         public override bool Equals(object other)
  66         {
  67             Pair<TFirst, TSecond> otherPair = other as Pair<TFirst, TSecond>;
  68
  69             return (otherPair != null && Equals(otherPair));
  70         }
  71         #endregion
  72
  73         #region InternalBase
  74         internal override void ToCompactString(StringBuilder builder)
  75         {
  76             builder.Append("<");
  77             builder.Append(first.ToString());
  78             builder.Append(", "+second.ToString());
  79             builder.Append(">");
  80         }
  81         #endregion
  82
  83
  84         internal class PairComparer : IEqualityComparer<Pair<TFirst, TSecond>>
  85         {
  86             private PairComparer() { }
  87
  88             internal static readonly PairComparer Instance = new PairComparer();
  89             private static readonly EqualityComparer<TFirst> firstComparer = EqualityComparer<TFirst>.Default;
  90             private static readonly EqualityComparer<TSecond> secondComparer = EqualityComparer<TSecond>.Default;
  91
  92             public bool Equals(Pair<TFirst, TSecond> x, Pair<TFirst, TSecond> y)
  93             {
  94                 return firstComparer.Equals(x.First, y.First) && secondComparer.Equals(x.Second, y.Second);
  95             }
  96
  97             public int GetHashCode(Pair<TFirst, TSecond> source)
  98             {
  99                 return source.GetHashCode();
 100             }
 101         }
 102     }
 103
 104
 105
 106 }